ACS717 查看數據表（PDF） - Allegro MicroSystems

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ACS717

High Isolation, Linear Current Sensor IC with 850 µΩ Current Conductor

Allegro MicroSystems 

ACS717

High Isolation, Linear Current Sensor IC with

850 µΩ Current Conductor

FEATURES AND BENEFITS

• IEC/UL 60950-1 Ed. 2 certified to:

□□Dielectric Strength = 4800 Vrms (tested for 60

seconds)

□□Basic Isolation = 1550 Vpeak

□□Reinforced Isolation = 800 Vpeak

• Small footprint, low-profile SOIC16 wide-body package

suitable for space constrained applications that require

high galvanic isolation

• 0.85 mΩ primary conductor for low power loss and high

inrush current withstand capability

• Low, 400 μARMS√Hz noise density results in typical

input referred noise of 70 mA(rms) at max bandwidth (40

kHz)

• 3.3 V, single supply operation

• Output voltage proportional to AC or DC current

• Factory-trimmed sensitivity and quiescent output voltage

for improved accuracy

• Chopper stabilization results in extremely stable

quiescent output voltage

• Ratiometric output from supply voltage

TÜV America

Tytpeested

Certificate Number:

U8V 14 11 54214 030

CB 14 11 54214 029

CB Certificate Number:

US-22339-A1-UL

Package: 16-Pin SOICW (suffix MA)

Approximate Scale 1:1

DESCRIPTION

TheAllegro™ACS717 current sensor IC is an economical, high

isolation solution for AC or DC current sensing in industrial,

commercial, and communications systems. The small package

is ideal for space constrained applications, though the wide-

body provides the creepage and clearance needed for high

isolation. Typical applications include motor control, load

detection and management, switched-mode power supplies,

and overcurrent fault protection.

The device consists of a low-offset, linear Hall sensor circuit

with a copper conduction path located near the surface of the

die.Applied current flowing through this copper conduction path

generates a magnetic field which is sensed by the integrated Hall

IC and converted into a proportional voltage. Device accuracy

is optimized through the close proximity of the magnetic field

to the Hall transducer. A proportional voltage is provided by

the low-offset, chopper-stabilized BiCMOS Hall IC, which

is programmed for accuracy after packaging. The output of

the device has a positive slope when an increasing current

flows through the primary copper conduction path (from pins

1 through 4, to pins 5 through 8), which is the path used for

current sensing. The internal resistance of this conductive path

is 0.85 mΩ typical, providing low power loss.

The terminals of the conductive path are electrically isolated

from the sensor leads (pins 10 through 15 ). This allows the

ACS717 current sensor IC to be used in high-side current sense

applications without the use of high-side differential amplifiers

or other costly isolation techniques.

The ACS717 is provided in a small, low profile surface mount

SOICW16 package (suffix MA). The device is lead (Pb) free

with 100% matte tin leadframe plating. The device is fully

calibrated prior to shipment from the factory.

1

IP+

2

+IP

IP+

3

IP+

4

IP+

16

NC

15

GND

14

NC

13

NC

IP

ACS717

12

VIOUT

5

IP–

–IP

6

IP–

7

IP–

8

IP–

11

NC

10

VCC

9

NC

The ACS717 outputs an

analog signal, VIOUT , that

changes, proportionally,

with the bidirectional AC

or DC primary sensed

CL

current, IP , within the

specified measurement

range.

CBYPASS

0.1 µF

ACS717-DS

Typical Application

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